How to seal 440 dipstick tube elbow?

[MOPARoldtimer]

My 440 has the stock oil pan with the male threads of a 90º brass street elbow (pictured) screwed into the driver's side of the oil pan. The end of the dipstick tube is flared and has a male fitting which threads into street elbow. I have a persistent oil leak where the elbow screws into the oil pan. Last time I tried to fix it I used non-hardening Permatex, but that didn't work.

What should I use to seal this? Rectorseal 5? Rectorseal 7? Indian Head gasket cement? Or something else? I know Rusty will lay the answer on me. Thanks in advance!

 

[Woods74]

Tried plumber's tape?

 

[66plyValiant]

these shouldn't need tape as they don't seal on the threads on the dipstick side of it, where it screws into the pan would need it though

it should have a double flare on the dipstick tube and be a good flare, if its ovaled or off centered thats an issue, also I've seen before that the brass fitting that screws into the pan gets a mark in the flare part and won't seal

check all these and let use know, sealer; tape or any other goop isn't going to solve the problem

 

[RustyRatRod]

Damned if I wouldn't disassemble it and look for a crack on the thread boss in the pan.

 

[440outlawdart]

I would look for a crack too after no sealer help,even Teflon tape might expand it and make the leak more

 

[MOPARoldtimer]

Thanks a lot, guys. I'll check everything you've suggested.

 

[MOPARoldtimer]

I do believe you guys were right. There seemed to be a small crack at the top of the threaded boss, between the boss and the oil pan. I am trying Rectorseal 5 on it because I've had good luck with it in the past. If that doesn't work, I'll have to pull the pan and braze it.